1》 become fully aware of as a fact; understand clearly.
2》 cause to happen.
↘achieve (something desired or anticipated); fulfil.
3》 give actual or physical form to (a concept or work).
↘ Music add to or complete (a piece of music left sparsely notated by the composer).
4》 sell for or make a profit of.
↘convert (an asset) into cash.
C17: from real 1 , on the pattern of Fr. réaliser .